If it don't give you what you want or you're too ♥♥♥♥ing lazy then find a modder that you actually use and ask them to make a mod where merchants sell dragonbones or a mod that inserts a new merchant who sells Dragonbones.

its not that the dragons are hard its that it takes to long to wait for them to turn up

For me they were showing up all the time. I read something about fast travel making them appear more often. I found when I fast travelled to Riverwood they appeared a lot. The console command isn't a bad idea. You could also install Deadly Dragons to get more dragons. I would recommend Run For Your Lives http://skyrim.nexusmods.com/mods/23906/?which makes citizens run indoors when dragons attack so they don't get killed.